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bw_math: add bw_log2_1p2xf, bw_log_1pexpxf, bw_log10_1p10xf

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Stefano D'Angelo 2024-11-01 12:24:15 +01:00
parent 6431749bf8
commit b214bc896e
1 changed files with 57 additions and 4 deletions
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61
include/bw_math.h
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@ -46,10 +46,12 @@
* <ul>
* <li>Version <strong>1.1.0</strong>:
* <ul>
* <li>Added <code>bw_signfilli64</code>, <code>bw_mini64</code>,
* <code>bw_maxi64</code>, <code>bw_clipi64</code>,
* <code>bw_minu64</code>, <code>bw_maxu64</code>, and
* <code>bw_clipu64</code>.</li>
* <li>Added <code>bw_signfilli64()</code>, <code>bw_mini64()</code>,
* <code>bw_maxi64()</code>, <code>bw_clipi64()</code>,
* <code>bw_minu64()</code>, <code>bw_maxu64()</code>,
* <code>bw_clipu64()</code>, <code>bw_log2_1p2xf()</code>,
* <code>bw_log_1pexpxf()</code>, and
* <code>bw_log10_1p10xf()</code>.</li>
* <li>Added support for <code>BW_INCLUDE_WITH_QUOTES</code> and
* <code>BW_CXX_NO_EXTERN_C</code>.</li>
* </ul>
@ -534,6 +536,33 @@ static inline float bw_pow10f(
*
* Relative error < 0.062%.
*
* #### bw_log2_1p2xf()
* ```>>> */
static inline float bw_log2_1p2xf(
float x);
/*! <<<```
* Returns an approximation of `log2(1+2^x)`.
*
* Absolute error < 0.006.
*
* #### bw_log_1pexpxf()
* ```>>> */
static inline float bw_log_1pexpxf(
float x);
/*! <<<```
* Returns an approximation of `log(1+exp(x))`.
*
* Absolute error < 0.004.
*
* #### bw_log10_1p10xf()
* ```>>> */
static inline float bw_log10_1p10xf(
float x);
/*! <<<```
* Returns an approximation of `log10(1+10^x)`.
*
* Absolute error < 0.002.
*
* #### bw_dB2linf()
* ```>>> */
static inline float bw_dB2linf(
@ -1024,6 +1053,30 @@ static inline float bw_pow10f(
return y;
}
static inline float bw_log2_1p2xf(
float x) {
BW_ASSERT(!bw_is_nan(x));
const float y = x >= 32.f ? x : bw_log2f(1.f + bw_pow2f(x));
BW_ASSERT(bw_is_finite(y));
return y;
}
static inline float bw_log_1pexpxf(
float x) {
BW_ASSERT(!bw_is_nan(x));
const float y = 0.693147180559945f * bw_log2_1p2xf(1.442695040888963f * x);
BW_ASSERT(bw_is_finite(y));
return y;
}
static inline float bw_log10_1p10xf(
float x) {
BW_ASSERT(!bw_is_nan(x));
const float y = 0.3010299956639811f * bw_log2_1p2xf(3.321928094887363f * x);
BW_ASSERT(bw_is_finite(y));
return y;
}
static inline float bw_dB2linf(
float x) {
BW_ASSERT(!bw_is_nan(x));